Chambers of a moving bed

In a catalytic reactor, an enclosure delimited by at least one wall (1), comprising:

• at least one opening (12) for the introduction of substantially similar solid granular particles into the catalytic reactor enclosure, the particles having a mean diameter in the range of 0.1 mm to 6 mm,
• at least one grill (3, 4) delimiting a moving bed of said particles which circulates in the enclosure in a direction substantially parallel to said grill,
• at least one opening (14) for the introduction of at least one fluid which circulates in said bed of particles in a different direction from that of the assembly of the particles and issues from said bed by way of at least one grill (4),
• at least one opening (15) for the outer of said fluid particles from the catalytic reactor enclosure,
• at least one opening (13) for the outlet of said particles from the catalytic reactor enclosure,
• the improvement comprising at least one intermediate wall and disposed in the moving bed of particles, said wall being permeable to the fluid but impermeable to the solid granular particles and disposed substantially in the direction of flow of the particles, situated at between 0.1 e and 0.75 e, e being the complete thickness of the bed, from the grill by way of which the fluid issues, wherein the maximum flow rate of blocking of the particles against the walls is identical for each of the separate zones, said intermediate wall having a coefficient of friction with the particles of between 0.1 and 0.7.